/* ===================

AX2E (AXESCON XACML 2.0 Engine) is the Java authorization engine, which implements OASIS XACML 2.0 standard.
Copyright (C) 2007 AXESCON LLC

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA


Contact: AXESCON LLC - info{at}axescon.com

 =================== */
package axescon.xacml.engine.fn;

import axescon.xacml.api.AbstractFn;
import axescon.xacml.api.ExpressionEvalIndeterminateException;
import axescon.xacml.api.Fn;
import axescon.xacml.api.Liquid;
import axescon.xacml.model.policy.AttributeValue;

/**
 * @author Date: Sep 28, 2005
 *         Responsibilities: implements basic binary operations
 *         takes two operands of the same type, and return one of the same
 */
public abstract class FnBaseUnaryOp extends AbstractFn implements Fn, UnaryOpFn {

    public int getArgTypeListLength() {
        return 1;
    }

    public Liquid exec(Liquid[] args) throws ExpressionEvalIndeterminateException {
        return new Liquid(exec1(args[0].getSingularUnsafe()));
    }

    public AttributeValue exec(AttributeValue arg0) throws ExpressionEvalIndeterminateException {
        return exec1(arg0);
    }

    abstract AttributeValue exec1(AttributeValue arg0) throws ExpressionEvalIndeterminateException;

}
